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Abstract

We investigate the combined effect of Raman and parametric gain on single-pump parametric amplifiers. The phasematched parametric gain is shown to depend strongly on the real part of the complex Raman susceptibility. In fused silica fibers this results in a significant reduction in the available parametric gain for signal detunings beyond 10 THz. We are able to experimentally measure this effect for signal detunings ranging from 7 to 22 THz. Finally we discuss the implications of these results for the design of broadband optical parametric amplifiers.

Sideband power asymmetry as a function of normalized wavevector mismatch K and the signal detuning Ω. This calculation uses the complex Raman susceptibility curve of Fig. 1. Inset is the graph of the power asymmetry versus Ω for a phasematched process (K = 1).

Measured parametric gain for an anti-Stokes seed as a function of seed detuning (circles). The solid line is the prediction of Eq. (8) with γ = 2.53 W-1km-1 and f = 0.18. The pump wavelength is 1555.7 nm, and the input pump peak power is 82 W.

Measured phasematched parametric gain for an anti-Stokes seed as a function of detuning (circles). The solid line is the prediction of Eq. (8) with γ = 2.53 W-1km-1 and f = 0.18. The input pump peak power is 82 W.